title: Foxa2 regulates leukotrienes to inhibit Th2-mediated pulmonary inflammation.
abstract: Foxa2 is a member of the Forkhead family of nuclear transcription factors that is highly expressed in respiratory epithelial cells of the developing and mature lung. Foxa2 is required for normal airway epithelial differentiation, and its deletion causes goblet-cell metaplasia and Th2-mediated pulmonary inflammation during postnatal development. Foxa2 expression is inhibited during aeroallergen sensitization and after stimulation with Th2 cytokines, when its loss is associated with goblet-cell metaplasia. Mechanisms by which Foxa2 controls airway epithelial differentiation and Th2 immunity are incompletely known. During the first 2 weeks after birth, the loss of Foxa2 increases the production of leukotrienes (LTs) and Th2 cytokines in the lungs of Foxa2 gene-targeted mice. Foxa2 expression inhibited 15-lipoxygenase (Alox15) and increased Alox5 transcription, each encoding key lipoxygenases associated with asthma. The inhibition of the cysteinyl LT (CysLT) signaling pathway by montelukast inhibited IL-4, IL-5, eotaxin-2, and regulated upon activation normal T cell expressed and presumably secreted expression in the developing lungs of Foxa2 gene-targeted mice. Montelukast inhibited the expression of genes regulating mucus metaplasia, including Spdef, Muc5ac, Foxa3, and Arg2. Foxa2 plays a cell-autonomous role in the respiratory epithelium, and is required for the suppression of Th2 immunity and mucus metaplasia in the developing lung in a process determined in part by its regulation of the CysLT pathway.
authors.affiliation: 1 Research Center of Regeneration Medicine.
authors.forename: Xiaoju
authors.initials: X
authors.lastname: Tang
authors.forename: Xiaojing J
authors.initials: XJ
authors.lastname: Liu
authors.forename: Cuijie
authors.initials: C
authors.lastname: Tian
authors.forename: Qiaoli
authors.initials: Q
authors.lastname: Su
authors.forename: Yi
authors.initials: Y
authors.lastname: Lei
authors.forename: Qingbo
authors.initials: Q
authors.lastname: Wu
authors.forename: Yangyan
authors.initials: Y
authors.lastname: He
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Whitsett
authors.forename: Fengming
authors.initials: F
authors.lastname: Luo
mesh_terms: D000085:Acetates / Q000494:pharmacology; D000818:Animals; D001092:Arachidonate 12-Lipoxygenase / Q000235:genetics; D001093:Arachidonate 15-Lipoxygenase / Q000235:genetics; D001094:Arachidonate 5-Lipoxygenase / Q000235:genetics; D003521:Cyclopropanes; D003545:Cysteine / Q000276:immunology; D004195:Disease Models, Animal; D004804:Eosinophils / Q000187:drug effects / Q000276:immunology; D020397:Goblet Cells / Q000187:drug effects / Q000276:immunology / Q000473:pathology; D051542:Hepatocyte Nuclear Factor 3-beta / Q000172:deficiency / Q000235:genetics / Q000276:immunology*; D018836:Inflammation Mediators / Q000276:immunology; D020024:Leukotriene Antagonists / Q000494:pharmacology; D015289:Leukotrienes / Q000276:immunology*; D008679:Metaplasia; D051379:Mice; D018345:Mice, Knockout; D008822:Mice, Transgenic; D011014:Pneumonia / Q000209:etiology / Q000276:immunology* / Q000473:pathology; D011804:Quinolines / Q000494:pharmacology; D015398:Signal Transduction / Q000276:immunology; D013440:Sulfides; D018418:Th2 Cells / Q000276:immunology*
chemical_list: D000085:Acetates; D003521:Cyclopropanes; C496503:Foxa2 protein, mouse; D018836:Inflammation Mediators; D020024:Leukotriene Antagonists; D015289:Leukotrienes; D011804:Quinolines; D013440:Sulfides; C112381:cysteinyl-leukotriene; D051542:Hepatocyte Nuclear Factor 3-beta; C521960:Alox15 protein, mouse; D001092:Arachidonate 12-Lipoxygenase; D001093:Arachidonate 15-Lipoxygenase; D001094:Arachidonate 5-Lipoxygenase; D003545:Cysteine; C093875:montelukast